Question

cos 60=(1-2 sin ²30)=(2 cos ² 30-1)​

Answer 1

Answer:

step1:cos 60°=1/2

step2:(1-2sin^2 30°)

putting value of 30°

=(1-1/2)

=1/2

step3:(2cos^2 30°-1)

=2 (1-sin^2 30°)-1

=2-2sin^2 30°-1

=1-2sin^2 30°

=1/2

value of all are same

so they are equal.

Step-by-step explanation:

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Answer 2

Answer:

Answer:

step1:cos 60°=1/2

step2:(1-2sin^2 30°)

putting value of 30°

=(1-1/2)

=1/2

step3:(2cos^2 30°-1)

=2 (1-sin^2 30°)-1

=2-2sin^2 30°-1

=1-2sin^2 30°

=1/2

value of all are same

so they are equal.

Step-by-step explanation:

Hope it will help you Mark it brainlist. ...